In order to improve the precision of parameter estimation of reliability model,based on the analyses of traditional reliability model,the limitations of least square method and gradual linear approximation because of their hypothetical distribution to random variable are pointed out,and the parameter estimators of point and interval are given by bootstrap method.The calculating results show that the estimated interval,standard error of parameter and the standard residual errors of the model are both less than those estimated by traditional method.Bootstrap method can approximate the actual value quickly than traditional way when increasing simulative times,so this method is feasible and effective and has a better accuracy than the latter.